Synopsis
Lucretius wrote this epic poem to "Memmius", who may be the Gaius Memmius who in 58 BC was a praetor, a judicial official deciding controversies between citizens and the government. There are over a dozen references to "Memmius" scattered throughout the long poem in a variety of contexts in translation, such as "Memmius mine", "my Memmius", and "illustrious Memmius". Apparently, Lucretius wrote On the Nature of Things in an attempt to convert Gaius Memmius to atomism, but was unsuccessful.
Epicurus maintained that the unhappiness and degradation of humankind arose largely from the dread which they entertained of the power of the gods, from terror of their wrath, which was supposed to be displayed by the misfortunes inflicted in this life, and by the everlasting tortures which were the lot of the guilty in a future state, or where these feelings were not strongly developed, from a vague dread of gloom and misery after death. To remove these fears, and thus to establish tranquillity in the heart, was the purpose of his teaching. Thus the Gods, whose existence he did not deny, lived forevermore in the enjoyment of absolute peace, strangers to all the passions, desires, and fears, which agitate the human heart, totally indifferent to the world and its inhabitants, unmoved alike by their virtues and their crimes. To prove this position he called upon the atomism of Democritus, by which he sought to demonstrate that the material universe was formed not by a Supreme Being, but by the mixing of elemental particles which had existed from all eternity governed by certain simple laws. The task undertaken by Lucretius was to clearly state and fully develop these views in an attractive form; his work being an attempt to show that everything in nature can be explained by natural laws without the need for the intervention of divine beings.
Read more about this topic: De Rerum Natura